Yakusoku - Promise
[Yue] Mukashi Yoku Asonde kureta Kinjo no Kakkoii Onee-san ni 10-nen Mae no Yakusoku o Hatashite morai ni Iku Yatsu | Fulfilling a 10 Year Old Promise with the Cool Kid in the Neighborhood Who Used to Play with Me at the Park [English] [korafu]
I promise, I will become a knight to protect you
Uminari to Awaki Yakusoku | The Sound of The Sea And A Faint Promise